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Large Intercalation Pseudocapacitance in 2D VO 2 (B): Breaking through the Kinetic Barrier
Author(s) -
Xia Chuan,
Lin Zifeng,
Zhou Yungang,
Zhao Chao,
Liang Hanfeng,
Rozier Patrick,
Wang Zhiguo,
Alshareef Husam N.
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803594
Subject(s) - pseudocapacitance , materials science , van der waals force , kinetic energy , kinetics , intercalation (chemistry) , chemical physics , diffusion , ion , activation energy , diffusion barrier , activation barrier , lattice (music) , nanotechnology , thermodynamics , chemistry , molecule , density functional theory , computational chemistry , inorganic chemistry , layer (electronics) , physics , electrode , supercapacitor , electrochemistry , organic chemistry , quantum mechanics , acoustics
VO 2 (B) features two lithiation/delithiation processes, one of which is kinetically facile and has been commonly observed at 2.5 V versus Li/Li + in various VO 2 (B) structures. In contrast, the other process, which occurs at 2.1 V versus Li/Li + , has only been observed at elevated temperatures due to large interaction energy barrier and extremely sluggish kinetics. Here, it is demonstrated that a rational design of atomically thin, 2D nanostructures of VO 2 (B) greatly lowers the interaction energy and Li + ‐diffusion barrier. Consequently, the kinetically sluggish step is successfully enabled to proceed at room temperature for the first time ever. The atomically thin 2D VO 2 (B) exhibits fast charge storage kinetics and enables fully reversible uptake and removal of Li ions from VO 2 (B) lattice without a phase change, resulting in exceptionally high performance. This work presents an effective strategy to speed up intrinsically sluggish processes in non‐van der Waals layered materials.